MICROCORYPHIA, AND

Roca, Carmen Bach De, Gaju-Ricart, Miguel, Molero-Baltanás, Rafael & Mendes, Luis F., 2010, A new genus of Petrobiinae (Insecta, Microcoryphia, Machilidae) from Greece, Zoosystema 32 (2), pp. 259-265 : 264-265

KEY TO THE EXTANT SUBFAMILIES OF MICROCORYPHIA AND GENERA OF PETROBIINAE

1. Abdominal sternites II-VII small; second article of the maxillary palp of male with a hook- like process on its dorsal distal end; penis shorter or almost half of length of coxites IX; without paramera .................................................................. family Meinertellidae

— Abdominal sternites II-VII well developed; second article of the maxillary palp of male without a hook-like process; penis longer than half of length of coxites IX; parameres present at least on abdominal segment IX ..................................... family Machilidae . 2

2. Scapus, pedicellus and flagellum of antennae, maxillary and labial palps, legs and abdominal stily with scales ........................................................................... subfamily Machilinae

— Scales absent of flagellum of antennae, maxillary and labial palps, legs and abdomial stily .......................................................................................................................... 3

3. Scales absent on scapus, pedicellus and flagellum of antennae. Penis longer than abdominal coxite IX. Parameres VIII absent, IX annulated ....................... subfamily Petrobiellinae

— Scales absent of flagellum of antennae, but present on scapus and pedicellus. Penis variable in length. Parameres present only on the IX abdominal segment or on the VIII and IX ............................................................................................... subfamily Petrobiinae . 4

4. 1+1 eversible vesicles present along abdominal segments I-VII ................................... 5

— 2+2 eversible vesicles present on some abdominal segments (at least II-V) ................ 10

5. Paired ocelli round-triangular, ovoid or wide sub-rectangular, scattered from the sagittal line, their distance always much greater than their width ............................................ 6

— Paired ocelli shoe-shaped, attaining the frontal ante-ocular area .................................. 8

6. Distal article of labial palp distinctly widened, sub-triangular, in males and females. Without paramera VIII ........................................................................... Leptomachilis

— Distal article of labial palp not widened, sub-cylindrical in both sexes. With paramera VIII and IX ................................................................................................................ 7

7. Frons clearly protruded between paired ocelli. Antennae shorter than or as long as body. Males: apical article of maxillary palp sub-cylindrical and with ventral setulae; median article of labial palp strongly convex ..................................................... Neomachilis s.s.

— Frons slightly protruded between the paired ocelli. Antennae longer than body. Males: apical article of maxillary palp modified or not, without ventral setulae; median article of labial palp not modified ........................................................... Neomachilis (Nesochilis)

8. Distal area of mandible with four well-developed apical teeth. Paramera annulated, slightly shorter than penis. Male genitalia completely covered by the IXth coxites. Coxites with setae or spines ........................................................................................... Pedetontinus

— Distal area of mandible with 1-3 inconspicuous teeth, or blunt. Paramera not annulated; the penis long and stout. Male genitalia partially exposed. Coxites devoid of spines, the setae, if present, scarce ................................................................................................ 9

9. Pigment dark, on head and appendages. Apical article of labial palp somewhat widened, sub-triangular. Paramera shorter than penis, more or less cylindrical. Basal part of penis glabrous ................................................................................................... Parapetrobius

— Pigment faint, on the head only. Apical article of labial palp cylindrical, thin. Paramera long, distally curved and embracing the penis. Basal part of penis with two rows of small spines .......................................................................................... Kerkiratrobius n. gen.

10. Paired ocelli transverse, pear-shaped to sub-elliptical, their medials distance at least as long as their width. Only paramera IX ............................................................................. 11 — Paired ocelli shoe-shaped, their medial distance smaller than their width (sometimes touching). Paramera variable .................................................................................... 12

11. 2+2 eversible vesicles on abdominal segments II-V ............................... Petridiobius s.s.

— 2+2 eversible vesicles on abdominal segments II-VI ................ Petridiobius (Pacltiobius)

12. Paramera annulated, on segments VIII and IX ......................................................... 13

— Paramera annulated or entire, restricted to segment IX ............................................. 14

13. Abdominal sternites wide, obtuse-angled. Apical spine of abdominal stylets short and stout. P I of male modified ....................................................................... Meximachilis

— Abdominal sternites small to medium-sized, acute-angled. Apical spine of abdominal stylets long and stout. P I of male not modified ........................................ Pedetontoides

14. Distal area of mandible smooth or with 1 or 2 inconspicuous teeth. Paramera short and entire, penis long and robust. Male genitalia partially exposed ........................ Petrobius

— Distal area of mandible with four well-developed teeth. Paramera annulated, penis typical. Male genitalia covered by the IXth coxites ................................................................ 15

15. Median urosternites obtuse-angled. 2+2 eversible vesicles on the abdominal segments II-VI ...................................................................................................... Pedetontus s.s.

— Abdominal sternites acute-angled to rectangular. 2+2 eversible vesicles on abdominal segments II-V. ........................................................................... Pedetontus (Verhoeffilis)